Access 2016 concatenation problem

I'm trying to create a directory for contacts, and I'm trying to put Prefix, FirstName, and LastName together, but it gives me the error #Type!.  The error indicator in Design View says it's a circular reference (image attached).  I only have one other table with a relationship to the main Contacts table, off which I'm making the form.  Could this be causing the problem?  What other info do I need to provide to help with this problem?

Thank you!
ScreenHunter_827-Dec.-14-14.39.jpg
MLGIS Program ManagerAsked:
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DatabaseMX (Joe Anderson - Microsoft Access MVP)Database Architect / Systems AnalystCommented:
Can you show the entire expression for the Control Source.
And the RecordSource for the Form ?
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MLGIS Program ManagerAuthor Commented:
Absolutely! Thank you
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MLGIS Program ManagerAuthor Commented:
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DatabaseMX (Joe Anderson - Microsoft Access MVP)Database Architect / Systems AnalystCommented:
Well ... seems the Record Source does not include Prefix or Last Name ?

Can you show the Full SQL for the Record Source ?
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MLGIS Program ManagerAuthor Commented:
Is this where it's located?  I'm looking for the SQL view, but it's not there.
ScreenHunter_833-Dec.-14-15.38.jpg
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PatHartmanCommented:
Two problems:
As Joe mentioned, The Form's RecordSource must contain all the columns you want to use.  Your's contains only FirstName.

Second problem.  You have reused the FirstName control which used to be bound to FirstName and now you want it to contain a concatenated value.  You MUST change the Name property of the control so that it doesn't duplicate the name of a field in the form's RecordSource.  So change the control's Name proeprty to something like txtFullname.
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